TY  - JOUR
AU  - Denis  Krotov
TI  - Perfect colorings of the infinite square grid: coverings and twin colors
JO  - The electronic journal of combinatorics
PY  - 2023
VL  - 30
IS  - 2
UR  - http://geodesic.mathdoc.fr/articles/10.37236/10005/
DO  - 10.37236/10005
ID  - 10_37236_10005
ER  -